1) take angle as x=135
arc tan|tanx| = arc tan|tan135|= arc tan|-1|= arc tan(1) = 45
|x|=135 WHICH IS NOT CORRECT so it is not True
true only in the 1st cordinant that is from [0, pi/2] and the fourth
the range of tanx is between [-90,90] so it is not true in 3 quadrants
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